Investigation On The Electrometric Measurement Experiment Of The Artificial Thoracic Model Of Pectus Excavatum With Scoliosis

The incidence of pectus excavatum in adolescents shows an increasing trend,while the Nuss procedure has become an important method of treatment,because of the lack of research on the cases of orthopedic mechanism for pectus excavatum with scoliosis,the Nuss procedure faced the risk of heavier scoliosis deformation,In addition,the lack of research in terms of experimental verification.In this paper,using two methods-a combination of numerical simulation and artificial thoracic model’s electrometric measurement experiment,investigation on the orthopedic of pectus excavatum with scoliosis’ s patient.Subject to ethical constraints,it can not be distributed in the electrometric measurement experiment to get the patient’s chest bones strain in the Nuss procedure in the current,at the same time because they can not obtain cadavers with pectus excavatum with scoliosis,also unable to do eelectrometric measurement experiment.However,with the development of digital medical technology can scan the patient’s thoracic CT,using Mimics,Geomagic studio,Pro/E,Solid Works software reconstruction and preparation finite element artificial thoracic model of pectus excavatum with scoliosis,simulating the Nuss procedure,and according to the results of numerical simulation,then guide and design of electrometric measurement experiment of the artificial thoracic model of pectus excavatum with scoliosis.Numerical simulation of finite element model including the sternum,ribs and thoracic vertebrae,using ANSYS software to simulate the Nuss procedure,take into account the influence of nonlinear geometry.Numerical simulation results show that when patients’ sternum is lifted after orthopedic,pectus excavatum symptoms improved significantly,while the scoliosis has relieved,confirming the position of pectus excavatum depression and the direction of the scoliosis in the same side,the Nuss procedure helps to improve the symptoms of scoliosis.The author design and manufacture of the Nuss procedure instruments,including orthopedic plate,bracket,penetrating device,plate bending device and turning device.Based on the rapid prototyping 3D printers,printing the selected case’s ribs,sternum,thoracic vertebra,preparation of artificial thoracic model of pectus excavatum with scoliosis for electrometric measurement experiment.In electrometric measurement experiment,according to the numerical simulation results,the electrometric measurement experiment is designed,and the paste position of the strain gauge is designed and directed,paste the strain gauge,then do the electrometric measurement experiment.Laboratory equipment including WDW-10 computer-controlled electrometric measurement experiment machine and DH3818-10 static and dynamic multi-channel resistance strain tester.The strain distribution of the thorax model in the process of correction is obtained by the electrometric measurement experiment,and the numerical results are compared with the experimental results.Numerical simulation and electrometric measurement experiment results show that pectus excavatum symptoms improved significantly,while have an impact on scoliosis orthopedic procedure,artificial thoracic model of pectus excavatum with scoliosis after orthopedic.For the paper case,chest deformity and scoliosis deformity on the same side of the bow,scoliosis symptoms improved,consistent clinical results of this surgery with the patient’s outcome.The research methods used in this paper,including numerical simulation results guide electrometric measurement experiment scheme design and arrangement of measuring points,moreover,the method which electrometric measurement experiment results validate the results of numerical simulation,it has positive significance to improve the level of the research of pectus excavatum with scoliosis.